//--------------------------------------------------------------------------
//	Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
//  All rights reserved.
//
//	Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are
//  met:
//
//	Redistributions of source code must retain the above copyright notice,
//  this list of conditions and the following disclaimer.
//	Redistributions in binary form must reproduce the above copyright
//  notice, this list of conditions and the following disclaimer in the
//  documentation and/or other materials provided with the distribution.
//	Neither the name of the Drew Davidson nor the names of its contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
//
//	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
//  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
//  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
//  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
//  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
//  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
//  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
//  DAMAGE.
//--------------------------------------------------------------------------
package org.more.ognl;
import java.lang.reflect.Array;
import java.util.Map;
/**
 * Implementation of PropertyAccessor that uses numbers and dynamic subscripts as
 * properties to index into Java arrays.
 * @author Luke Blanshard (blanshlu@netscape.net)
 * @author Drew Davidson (drew@ognl.org)
 */
@SuppressWarnings("rawtypes")
public class ArrayPropertyAccessor extends ObjectPropertyAccessor implements PropertyAccessor // This is here to make javadoc show this class as an implementor
{
    public Object getProperty(Map context, Object target, Object name) throws OgnlException {
        Object result = null;
        if (name instanceof String) {
            if (name.equals("length")) {
                result = new Integer(Array.getLength(target));
            } else {
                result = super.getProperty(context, target, name);
            }
        } else {
            Object index = name;
            if (index instanceof DynamicSubscript) {
                int len = Array.getLength(target);
                switch (((DynamicSubscript) index).getFlag()) {
                case DynamicSubscript.ALL:
                    result = Array.newInstance(target.getClass().getComponentType(), len);
                    System.arraycopy(target, 0, result, 0, len);
                    break;
                case DynamicSubscript.FIRST:
                    index = new Integer((len > 0) ? 0 : -1);
                    break;
                case DynamicSubscript.MID:
                    index = new Integer((len > 0) ? (len / 2) : -1);
                    break;
                case DynamicSubscript.LAST:
                    index = new Integer((len > 0) ? (len - 1) : -1);
                    break;
                }
            }
            if (result == null) {
                if (index instanceof Number) {
                    int i = ((Number) index).intValue();
                    result = (i >= 0) ? Array.get(target, i) : null;
                } else {
                    throw new NoSuchPropertyException(target, index);
                }
            }
        }
        return result;
    }
    public void setProperty(Map context, Object target, Object name, Object value) throws OgnlException {
        Object index = name;
        boolean isNumber = (index instanceof Number);
        if (isNumber || (index instanceof DynamicSubscript)) {
            TypeConverter converter = ((OgnlContext) context).getTypeConverter();
            Object convertedValue;
            convertedValue = converter.convertValue(context, target, null, name.toString(), value, target.getClass().getComponentType());
            if (isNumber) {
                int i = ((Number) index).intValue();
                if (i >= 0) {
                    Array.set(target, i, convertedValue);
                }
            } else {
                int len = Array.getLength(target);
                switch (((DynamicSubscript) index).getFlag()) {
                case DynamicSubscript.ALL:
                    System.arraycopy(target, 0, convertedValue, 0, len);
                    return;
                case DynamicSubscript.FIRST:
                    index = new Integer((len > 0) ? 0 : -1);
                    break;
                case DynamicSubscript.MID:
                    index = new Integer((len > 0) ? (len / 2) : -1);
                    break;
                case DynamicSubscript.LAST:
                    index = new Integer((len > 0) ? (len - 1) : -1);
                    break;
                }
            }
        } else {
            if (name instanceof String) {
                super.setProperty(context, target, name, value);
            } else {
                throw new NoSuchPropertyException(target, index);
            }
        }
    }
}
